Right click and "save as..." to download icons to your computer. Then follow your AIM instructions to make it your icon. Boof.
She loved her biker like an icon...does anyone even use AIM anymore? I assume since I don't, nobody does. That's the way the world works. And what's the deal with iChat? It's like the little borther AIM never wanted. That thing is terrible. Just because there's an "i" in front of it, doesn't make it good, Apple. If you do happen to use AIM, you should make that pineapple your icon. He's pretty awesome.